不同LAB基散射器质子光响应的测量及其对中微子-质子散射超新星探测的意义
Measurement of the proton light response of various LAB based scintillators and its implication for supernova neutrino detection via neutrino-proton scattering
摘要：
在1 - 17.15MeV能量范围内，首次测量了以直链烷基苯（LAB）为基础的各种质子转换器的电子当量能量质子光输出函数。测量是在德国联邦物理技术研究所（PTB）使用具有连续能量分布的中子束进行的。质子光输出数据是从闪烁体中中子-质子散射产生的质子反冲光谱中提取的。质子光输出的功能行为成功地由Birks定律描述，对于不同的LAB溶液，Birks常数kB在（0.0094 +/- 0.0002）cm/MeV和（0.0098 +/- 0.0003）cm/MeV之间。常数C是广义伯克斯定律中二次项的参数，对于所有研究过的中子，C的上限（95% CL）都为零，约为10^{-7} cm ^2/MeV ^2。由此产生的猝灭因素是特别重要的未来计划的超新星中微子探测的基础上弹性散射的中微子质子。讨论了质子淬灭对中微子-质子散射产生的超新星事件产额的影响。
英文摘要：
The proton light output function in electron-equivalent energy of various scintillators based on linear alkylbenzene (LAB) has been measured in the energy range from 1 MeV to 17.15 MeV for the first time. The measurement was performed at the Physikalisch-Technische Bundesanstalt (PTB) using a neutron beam with continuous energy distribution. The proton light output data is extracted from proton recoil spectra originating from neutron-proton scattering in the scintillator. The functional behavior of the proton light output is described succesfully by Birks' law with a Birks constant kB between (0.0094 +/- 0.0002) cm/MeV and (0.0098 +/- 0.0003) cm/MeV for the different LAB solutions. The constant C, parameterizing the quadratic term in the generalized Birks law, is consistent with zero for all investigated scintillators with an upper limit (95% CL) of about 10^{-7} cm^2/MeV^2. The resulting quenching factors are especially important for future planned supernova neutrino detection based on the elastic scattering of neutrinos on protons. The impact of proton quenching on the supernova event yield from neutrino-proton scattering is discussed.
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